linux/poky.git/meta/recipes-core/busybox/files/mdev, branch master

The poky repository master branch is no longer being updated.

2025-11-07T13:31:53+00:00

You can either: a) switch to individual clones of bitbake, openembedded-core, meta-yocto and yocto-docs b) use the new bitbake-setup You can find information about either approach in our documentation: https://docs.yoctoproject.org/ Note that "poky" the distro setting is still available in meta-yocto as before and we continue to use and maintain that. Long live Poky! Some further information on the background of this change can be found in: https://lists.openembedded.org/g/openembedded-architecture/message/2179 Signed-off-by: Richard Purdie

busybox: Run mdev as daemon

2020-12-20T00:03:05+00:00

When busybox is used for device management, kernel needs to support older/obsolete mechanism via CONFIG_UEVENT_HELPER and CONFIG_UEVENT_HELPER_PATH to enable /proc/sys/kernel/hotplug but this would require kernel defconfig change and will always be needed when mdev is used, intead run it in daemon mode Update mdev init script to run mdev in daemon mode (From OE-Core rev: f9e84b31ea4afe566c76dcdea25960478cd36ecc) Signed-off-by: Khem Raj Signed-off-by: Richard Purdie

busybox/mdev: Ensure /sys is mounted before using it

2016-05-13T12:41:30+00:00

echo would fail if /sys is not mounted and boot would abort (From OE-Core rev: b8901336e72639342a1d784557043fa47a9d90ff) Signed-off-by: Khem Raj Signed-off-by: Richard Purdie

busybox: mdev: Ensure /dev/initctl exists after tmpfs mount

2014-07-23T20:59:13+00:00

During boot, there is a brief window during which /dev/initctl is missing, which breaks initscripts that would need to access it. This occurs because /etc/init.d/mountall.sh (rcS.d/S02...) attempts to ensure /dev/initctl is present, but /etc/init.d/mdev (rcS.d/S06...) mounts over /dev and clobbers the work done by mountall, and then does not wait synchronously until initctl is ready before continuing. To close this window, in /etc/init.d/mdev, we check whether /dev/initctl is present, and if not, we remove it and recreate it. This is the same thing that is done by /etc/init.d/mountall.sh, and we have verified that any writers of /dev/initctl will wait synchronously until sysvinit notices the change in fd and does the read, so no race exists. (From OE-Core rev: 53543363a8ab4424c17ed7aec0e8aefc4df86b3d) Signed-off-by: Richard Tollerton Signed-off-by: Ben Shelton Signed-off-by: Richard Purdie

busybox: mdev: Use mdev.seq

2014-07-23T20:59:13+00:00

/dev/mdev.seq exists to synchronize concurrently running instances of mdev and to ensure that they execute in the proper order. Without this synchronization, it is possible to have inconsistent mount points, to leak device nodes, or to have a node erroneously removed in rapid hotplug scenarios. Enable the use of mdev.seq by creating an empty /dev/mdev.seq at boot. (From OE-Core rev: 3b256653ae9ab2cf56b21cb82a8bd2a562397b27) Signed-off-by: Richard Tollerton Signed-off-by: Ben Shelton Signed-off-by: Richard Purdie

busybox: mdev: Make /dev/shm world-writable

2014-07-23T20:59:13+00:00

Otherwise, users cannot use named semaphores or shared memory. (From OE-Core rev: a8f35be467836d8fa0bc8f8e85eba6f89a13f087) Signed-off-by: Richard Tollerton Signed-off-by: Ben Shelton Signed-off-by: Richard Purdie

busybox: add support to mdev

2011-05-10T08:57:08+00:00

This changes the packaging only if the configuration used has mdev support enabled. (From OE-Core rev: 82b163043aa53488a03bb3de3a78e5b6eeb76019) Signed-off-by: Otavio Salvador Signed-off-by: Richard Purdie